Shuichi Saeki (Masahiro Higashide) was a detective, but he quit his job. He now he works at a detective agency. One day, a couple asks the detective agency to find a man named Sakagami. The man killed the couple's son and served at a youth detention center. Masato Kogure (Yutaka Matsushige) is the director at the detective agency. He tells Shuichi Saeki to work on the case. Shuichi Saeki is also part of a victim's family. When he was a child, his older sister was murdered. While Shuichi Saeki watches Sakagami, the couple asks him to find some materials which will allow them to forgive Sakagami or not.